The Galactic Component of the SDSS All Point Source Survey

Details The Galactic Component of the SDSS All Point Source Survey The Galactic Component of the SDSS All Point Source Survey

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.1424s&link_type=abstract

American Astronomical Society, AAS Meeting #211, #14.24; Bulletin of the American Astronomical Society, Vol. 39, p.763

Astronomy and Astrophysics

Astrophysics

Scientific paper

The SDSS-I and SEGUE projects have made significant contributions to our knowledge of the Galaxy's structure and formation history. The majority of stellar samples of these projects are constructed using cuts in SDSS ugriz color-space to targeted specific categories of stars. The selection effects imposed by the employed selection criteria limits the resulting samples use for the investigations of aspects of Galactic structure which require unbiased samples, such as stellar populations studies and luminosity function determinations. The Galactic component of the SDSS all point survey described in this work provides a unbiased stellar sample well suited for such studies.
The all point source survey is comprised of 14800 stellar spectra randomly selected for observation with the SDSS spectrograph (R=2000)from a collection of point source objects with clean photometric observations and i-band magnitudes above 19.1. Not surprisingly, a large portion of the resulting sample consists of faint stars near limiting magnitude cutoff. Analysis of low luminosity portion of the sample is complicated by the poor quality of the obtained spectra, 59% of the sample has a average per pixel S/N less than 10.
We describe refinements made to the SDSS Spectroscopic Parameter Pipeline (SSPP) to appropriately handle the low S/N component of the sample.
We then detail the observed stellar parameter distributions from the refined SSPP for spectral type, [Fe/H], effective temperature, and radial velocity and compare the resulting distributions to predictions from the Robin et al. (2003) model using canonical galactic parameters.
TCB, YSL, and TS acknowledge support from grant PHY 02-16783; Physics Frontier Center/Joint Institute for Nuclear Astrophysics (JINA), awarded by the U.S. National Science Foundation.

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